A discussion about the Roma Pass you might find helpful:
https://community.ricksteves.com/travel-forum/italy/passes-and-money
Just ignore the part of the discussion about Florence's Firenzecard if not visiting that city. My own 2-cents? It's not worth the money for just 2 entrances, and a couple of popular attractions mandate advance, timed-entry reservations even if using the pass. We've also found that we've needed to use public transport very little in Rome - its a lot more fun to walk, and sometimes an even faster way to get from one place to another - so not enough to make a pass worthwhile. We bought a few BIT tickets and tucked them away for when we might want them.
How much you'll need/want to use transit may depend on the location of your hotel and/or how much walking you're able to comfortably do.
Heads up: take note of the work on metro line A that will interrupt service during certain hours for quite some time.
https://www.atac.roma.it/en/modernisation-of-rome%27s-metro-line-a